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"How to Develop a Super-Power Memory," by Harry Lorayne: Low density content.

Memory Master

Memory Page memory course

"Harry Kahne: Multiple Memory Course":"A Series of the Exercises leading to the Development of Greater Mental Power. A True Course in Right/Left Brain Training, Development of Creative Intelligence and Conscious Fostering of Intuitive Powers" from the early 20th century.

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"Roth Memory Course," by David Roth

"Zufall's Memory Trix," by Bernard Zufall